the heater core water pump hoses including the heater hoses
check the heater core stopped up radiator
The top radiator hose is above the thermostat. If the top radiator hose is hot, the thermostat is opening. The thermostat is not the problem. Perhaps the radiator is clogged up or the water pump is bad. Look elsewhere.
It could be the thermostat. Open up the radiator cap when it is hot and see if the water is flowing in the radiator. If it is not then it may be a thermostat.
is the new thermostat rated to manufacturers specs? if so it coul be air in your coling system causing hot spots.or it could also be low/contaminated fluid. also check the radiator for leaks just had that problem was a small crack in plastic side casing of radiator.
Radiator plugged or restricted? Cooling system airbound? Water pump not circulating coolant? Radiator cap defective? Radiator hoses collapsing under pressure? Defective gauge/cooling temperature sensor?
Bad water pump , problem with engine cooling fan ( if it is actually running hot and not a problem with the gauge or sending unit )
If your radiator isnt leaking and car is having a over heating problem and coolant spewing out. Chances are your thermostat needs replaced. possible the radiator needs to be flushed. But more likley its thermostat
im having the same problem with my 1994 I've replaced the heater core,thermostat,radiator,i checked the coolant, and it's not over heating or nothing and still no heat lol
Assuming repairs have been performed properly and there are no DTC's; you have an electrical problem.
Your thermostat is stuck closed. you will need to replace it. The thermostat controls the circulation through the radiator - when the engine heats up the thermostat is meant to switch circulation from just-engine to engine+radiator. Sounds like this isn't happening.
Hi have you checked the radiator for blockage if it is blowing water back out the radiator this could be the problem.
Sounds like a fan or fan shroud problem, but you could also be dealing with a plugged radiator, undersize radiator, or thermostat problem.